Class – IX
Subject – Physics
Topic- Revision worksheet for Half yearly exams.
Q.1 Given below is the velocity-time graph for the motion of the car. What does
the nature of the graph show? Also find the acceleration of the car.
Q.2 An air-plane accelerates down a runway at 3.20 m/s2 for 32.8 s until is finally
lifts off the ground. Determine the distance travelled before take off.
Q.3 A racing car accelerates uniformly from 18.5 m/s to 46.1 m/s in 2.47 seconds.
Determine the acceleration of the car and the distance travelled.
Q.4 Honda Activa accelerates uniformly from rest to a speed of 7.10 m/s over a
distance of 35.4 m. Determine the acceleration of the bike.
Q.5 A bullet fired against a glass window pane makes a hole in it, and the glass
pane is not cracked. But on the other hand, when a stone strikes the same glass
pane, it gets smashed. Why is it so?
Q.6 Describe our walking in terms of Newton’s third law of motion.
Q.7 There are three solids made up of aluminium, steel and wood, of the same
shape and same volume. Which of them would have highest inertia?
Q.8 Derive the mathematical formula of conservation of momentum.
Q.9 What is the relationship between mass and inertia? Explain with the help of
examples.
Q.10 State Newton’s third law of motion. Explain with the help of examples.
Q.11 A 10 g bullet is shot from a 5 kg gun with a velocity of 400 m/s. What is the
speed of recoil of the gun?
Q.12 When two bodies A and B interact with each other. A exerts a force of 10 N
on B, towards east. What is the force exerted by B on A?
Q.13 A feather of mass 10 g is dropped from a height. It is found to fall down with
a constant velocity. What is the net force acting on it?
Q.14 A cushioned bed or a sand bed is bed is used in the athletic event ‘high
jump’. Why?
Q.15 Is some force required to move a body uniformly along a circle?